How to use

HadoopCoGroupClosure$TupleBuilder

in

cascading.flow.hadoop

@Override
public Tuple getGroupTuple( Tuple keysTuple )
 {
 Tuples.asModifiable( joinedTuple );
 for( int i = 0; i < collections.length; i++ )
  joinedTuplesArray[ i ] = collections[ i ].isEmpty() ? emptyTuple : keysTuple;
 joinedTuple = joinedBuilder.makeResult( joinedTuplesArray );
 return joinedTuple;
 }

@Override
public Tuple getGroupTuple( Tuple keysTuple )
 {
 Tuples.asModifiable( joinedTuple );
 for( int i = 0; i < collections.length; i++ )
  joinedTuplesArray[ i ] = collections[ i ].isEmpty() ? emptyTuple : keysTuple;
 joinedTuple = joinedBuilder.makeResult( joinedTuplesArray );
 return joinedTuple;
 }